rs1555949588

chrX-24518945-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_005391.5(PDK3):c.608C>G(p.Thr203Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. T203T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 22)
• Consequence: PDK3 NM_005391.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.61

Genes affected

PDK3 (HGNC:8811): (pyruvate dehydrogenase kinase 3) The pyruvate dehydrogenase (PDH) complex is a nuclear-encoded mitochondrial multienzyme complex that catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2). It provides the primary link between glycolysis and the tricarboxylic acid (TCA) cycle, and thus is one of the major enzymes responsible for the regulation of glucose metabolism. The enzymatic activity of PDH is regulated by a phosphorylation/dephosphorylation cycle, and phosphorylation results in inactivation of PDH. The protein encoded by this gene is one of the three pyruvate dehydrogenase kinases that inhibits the PDH complex by phosphorylation of the E1 alpha subunit. This gene is predominantly expressed in the heart and skeletal muscles. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PDK3	NM_005391.5	c.608C>G	p.Thr203Arg	missense_variant	6/11	ENST00000379162.9
PDK3	NM_001142386.3	c.608C>G	p.Thr203Arg	missense_variant	6/12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PDK3	ENST00000379162.9	c.608C>G	p.Thr203Arg	missense_variant	6/11	1	NM_005391.5	P1
PDK3	ENST00000568479.2	c.608C>G	p.Thr203Arg	missense_variant	6/12
PDK3	ENST00000648777.1	c.608C>G	p.Thr203Arg	missense_variant, NMD_transcript_variant	6/12

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Charcot-Marie-Tooth disease X-linked dominant 6 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 06, 2017

Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant has not been reported in the literature in individuals with PDK3-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with arginine at codon 203 of the PDK3 protein (p.Thr203Arg). The threonine residue is moderately conserved and there is a moderate physicochemical difference between threonine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Benign	0.040	T;.
FATHMM_MKL	Uncertain	0.96	D
M_CAP	Pathogenic	0.60	D
MetaRNN	Uncertain	0.67	D;D
MetaSVM	Benign	-0.51	T
MutationAssessor	Benign	0.93	L;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-0.96	N;N
REVEL	Uncertain	0.37
Sift	Uncertain	0.0080	D;D
Sift4G	Uncertain	0.022	D;D
Polyphen		0.29	B;.
Vest4		0.80
MutPred		0.45		Loss of ubiquitination at K205 (P = 0.0924);Loss of ubiquitination at K205 (P = 0.0924);
MVP		1.0
MPC		1.1
ClinPred		0.76	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.93

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1555949588; hg19: chrX-24537062;